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Sprinkler heads won't retract

Some pop-up sprinkler heads stuck and stay exposed after watering. Need to push them back down. They are TORO 570 Series, 3 inches. Do I need new heads or retracting springs, or can I just lubricate them?

The most likely cause of your problem is sand in teh gasket that surrounds the shaft. While teh system is running you can actuate the head by pushing down on it with your foot several times. Be careful to push straight down. This should flush out the sand. Toro sprinkler are just as good as the others.